But in other areas, nutrition recommendations for elite athletes and recreational athletes are similar. For example, an elite athlete requires only slightly more protein per pound of body weight than a recreational athlete.

"Some people believe eating extra protein helps build muscle. While protein is an important nutrient for athletes, exercise and training are responsible for building muscle size and strength, not eating excess protein," Mialki said.

She said some people use powders or supplements for their protein intake, but there's no evidence that this is better than getting protein from a healthy diet.

"When we are able, it's best to get all of our nutrients from whole food sources, including protein," Mialki said.